A kit of mysterious rocklike objects and a clear liquid. You had to supply your own container (mine was an egg shaped jar) drop the rocks in and pour the liquid in. At least I think that was the procedure...Then you'd wait and the rocks would grow into tall, brightly colored, mountain spikes. I had that jar for years until it got icky. Never knew what the chemical compounds were responsible for making those things, but always assumed they were horribly toxic...

Links for more info

The following are links about Magic Growing Rocks you may find interesting. Also check out the other =Toys of the 70s?> pages.

You can find these now in stores like KB Toys or walmart. It comes with a cheesy plastic container, colored rocks, and the liguid you make up. They don't grow real great anymore and it's pretty lame now. bummer.